Materials: Grey rubber with spiky texture and black PVC with strong synthetic ropes.
All materials are waterproof.
This backpack has two metal snaps inside.

By pulling the rope it converts from a backpack to a shoulder cross-body bag.
Ropes are adjustable.

Measurements: 45 x 30 x 13 cm

This is just a demo shop, but you can shop this product for real on the DIUDI site.